Commit a08f82d0 authored by Huang Ying's avatar Huang Ying Committed by Len Brown
Browse files

ACPI, APEI, Error Record Serialization Table (ERST) support 



ERST is a way provided by APEI to save and retrieve hardware error
record to and from some simple persistent storage (such as flash).

The Linux kernel support implementation is quite simple and workable
in NMI context. So it can be used to save hardware error record into
flash in hardware error exception or NMI handler, where other more
complex persistent storage such as disk is not usable. After saving
hardware error records via ERST in hardware error exception or NMI
handler, the error records can be retrieved and logged into disk or
network after a clean reboot.

For more information about ERST, please refer to ACPI Specification
version 4.0, section 17.4.

This patch incorporate fixes from Jin Dongming.

Signed-off-by: default avatarHuang Ying <ying.huang@intel.com>
Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
CC: Jin Dongming <jin.dongming@np.css.fujitsu.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent d334a491

Documentation/kernel-parameters.txt

+4 −0
Original line number Diff line number Diff line
@@ -750,6 +750,10 @@ and is between 256 and 4096 characters. It is defined in the file 
			Default value is 0.

			Value can be changed at runtime via /selinux/enforce.



	erst_disable	[ACPI]

			Disable Error Record Serialization Table (ERST)

			support.



	ether=		[HW,NET] Ethernet cards parameters

			This option is obsoleted by the "netdev=" option, which

			has equivalent usage. See its documentation for details.

drivers/acpi/apei/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -2,4 +2,4 @@ obj-$(CONFIG_ACPI_APEI) += apei.o 
obj-$(CONFIG_ACPI_APEI_GHES)	+= ghes.o

obj-$(CONFIG_ACPI_APEI_EINJ)	+= einj.o



apei-y := apei-base.o hest.o cper.o
 
apei-y := apei-base.o hest.o cper.o erst.o

drivers/acpi/apei/erst.c

0 → 100644
+855 −0

File added.

Preview size limit exceeded, changes collapsed.

include/acpi/apei.h

+21 −0
Original line number Diff line number Diff line
@@ -5,9 +5,30 @@ 
#ifndef ACPI_APEI_H

#define ACPI_APEI_H



#include <linux/acpi.h>

#include <linux/cper.h>

#include <asm/ioctls.h>



#define APEI_ERST_INVALID_RECORD_ID	0xffffffffffffffffULL



#define APEI_ERST_CLEAR_RECORD		_IOW('E', 1, u64)

#define APEI_ERST_GET_RECORD_COUNT	_IOR('E', 2, u32)



#ifdef __KERNEL__



extern int hest_disable;

extern int erst_disable;



typedef int (*apei_hest_func_t)(struct acpi_hest_header *hest_hdr, void *data);

int apei_hest_parse(apei_hest_func_t func, void *data);



int erst_write(const struct cper_record_header *record);

ssize_t erst_get_record_count(void);

int erst_get_next_record_id(u64 *record_id);

ssize_t erst_read(u64 record_id, struct cper_record_header *record,

		  size_t buflen);

ssize_t erst_read_next(struct cper_record_header *record, size_t buflen);

int erst_clear(u64 record_id);



#endif

#endif

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